rust - 有没有办法做unwrap_or_return一个错误(任何错误)

Question

在以下示例(最初从here复制)中，有什么方法可以简化返回值:

use std::num::ParseIntError;

fn multiply(first_number_str: &str, second_number_str: &str) -> Result<i32, ParseIntError> {
    let first_number = match first_number_str.parse::<i32>() {
        Ok(first_number)  => first_number,
        Err(e) => return Err(e),
    };

    let second_number = match second_number_str.parse::<i32>() {
        Ok(second_number)  => second_number,
        Err(e) => return Err(AnotherError::ParseError("error")),
    };

    Ok(first_number * second_number)
}

我的意思是:

use std::num::ParseIntError;

fn multiply(first_number_str: &str, second_number_str: &str) -> Result<i32, ParseIntError> {
    let first_number = first_number_str.parse::<i32>()
        .unwrap_or_return(|e| Err(e));

    let second_number = second_number_str.parse::<i32>()
        .unwrap_or_return(|e| Err(AnotherError::ParseError("error"));

    Ok(first_number * second_number)
}

Answer 1

您正在寻找question mark operator，可能与 Result::or 或 Result::or_else 结合使用，具体取决于您的用例。

该代码示例可以重写为

use std::num::ParseIntError;

pub fn multiply(first_number_str: &str, second_number_str: &str) -> Result<i32, ParseIntError> {
    let first_number = first_number_str.parse::<i32>()?;
    let second_number = second_number_str.parse::<i32>().or_else(|e| Err(e))?;
    // The closure in `or_else` could also return `Ok` or some different error with type `ParseIntError`.
    // let second_number = second_number_str.parse::<i32>().or_else(|_e| Ok(27))?;

    Ok(first_number * second_number)
}

(playground)

如果您知道要在 Ok中返回 or_else，则 Result::unwrap_or 更合适。在 Result上查看其他类似方法，以了解提供了什么。